CVE-2024-46760: wifi: rtw88: usb: schedule rx work after everything is set up
First published: Wed Sep 18 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: usb: schedule rx work after everything is set up Right now it's possible to hit NULL pointer dereference in rtw_rx_fill_rx_status on hw object and/or its fields because initialization routine can start getting USB replies before rtw_dev is fully setup. The stack trace looks like this: rtw_rx_fill_rx_status rtw8821c_query_rx_desc rtw_usb_rx_handler ... queue_work rtw_usb_read_port_complete ... usb_submit_urb rtw_usb_rx_resubmit rtw_usb_init_rx rtw_usb_probe So while we do the async stuff rtw_usb_probe continues and calls rtw_register_hw, which does all kinds of initialization (e.g. via ieee80211_register_hw) that rtw_rx_fill_rx_status relies on. Fix this by moving the first usb_submit_urb after everything is set up. For me, this bug manifested as: [ 8.893177] rtw_8821cu 1-1:1.2: band wrong, packet dropped [ 8.910904] rtw_8821cu 1-1:1.2: hw->conf.chandef.chan NULL in rtw_rx_fill_rx_status because I'm using Larry's backport of rtw88 driver with the NULL checks in rtw_rx_fill_rx_status.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.6.51 | |
| Linux Linux kernel | >=6.7<6.10.10 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1 | 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/25eaef533bf3ccc6fee5067aac16f41f280e343e
- https://git.kernel.org/stable/c/adc539784c98a7cc602cbf557debfc2e7b9be8b3
- https://git.kernel.org/stable/c/c83d464b82a8ad62ec9077637f75d73fe955635a
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46760
- https://nvd.nist.gov/vuln/detail/CVE-2024-46760
- https://launchpad.net/bugs/cve/CVE-2024-46760
- https://security-tracker.debian.org/tracker/CVE-2024-46760
- https://ubuntu.com/security/CVE-2024-46760
- https://git.kernel.org/linus/adc539784c98a7cc602cbf557debfc2e7b9be8b3
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